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Pest complex of onion and their management

KrishiKosh

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Title Pest complex of onion and their management
 
Creator S, Sudhirkumar
 
Contributor C. T, Ashok Kumar
 
Subject seasons, planting, oils, animal developmental stages, farmyard manure, land resources, onions, research methods, field experimentation, plant extracts
 
Description The survey on the seasonal incidence indicated the maximum population of Thrips tabaci (Lind.) and Agrotis ipsilon (Hufn.) during I fortnight of June. Whereas maximum population of Spodoptera litura (Fab.) and Helicoverpa armigera (Hub.) found during II fortnight of June during first season (June 2009 to August 2009). During second season (October 2009 to December 2009) the maximum population of T. Tabaci, S. litura and H.armigera found during II fortnight of October while A. ipsilon found during I fortnight of October. During III season (June 2010 to August 2010) the maximum population of all four insects were found during I fortnight of June. In different cropping system the minimum thrips population found in the cropping system of onion+chilli+tomato compared to onion grown as pure crop. Among 18 accessions screened to T. Tabaci and A. ipsilon, an accession Arka pragathi found to be promising accession. Treatment vermicompost + biofertilizers + neem cake (Full dose) was found to be best among organic source of nutrients and amendments against all four insects. The application Beauveria bassiana 1x109 spores/ml two times (20 & 30 DAP) against thrips and two times application of B.t. (30 & 40 DAP) against A. ipsilon, S. litura and H. armigera found to be best treatments among biocontrol agents. The treatment neem oil (3%) and treatment combination of VC+BF+NC+B. Bassiana+neem oil found to be best treatment among botanicals and integration of organic source of nutrients, botanicals and biocontrol agents respectively in reducing all above said four insects. Among indigenous materials lowest population of all four insects found in the treatment NSKE (4%). In case of insecticides imidacloprid found to be best treatment against thrips. Whereas emamectin benzoate found to be best treatment against A. ipsilon, S. litura and H. armigera. An avoidable loss of 69.26 per cent yield was observed in unprotected control where the crop was left for natural infestation compared to completely protected crop.
 
Date 2016-05-17T12:53:30Z
2016-05-17T12:53:30Z
2012-01-23
 
Type Thesis
 
Identifier Th-10192
http://krishikosh.egranth.ac.in/handle/1/66019
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru